High-precision measuring equipment for measuring the radial clearance of the shaft of an angular displacement potentiometer

Abstract

The present invention discloses a high-precision measuring device for measuring the radial clearance of the shaft of an angular displacement potentiometer, belonging to the production technical field of angular displacement potentiometers. The device includes a base, a micrometer, a potentiometer positioning mechanism, a pressure weight, a rough positioning mechanism for the micrometer, and a fine positioning mechanism for the micrometer. The rough positioning mechanism for the micrometer includes a transverse moving rod. The fine positioning mechanism for the micrometer includes a first "Z"-shaped plate, a second "Z"-shaped plate, a fine adjustment handle, and a fine adjustment screw. The positioning stud at the upper end of the fine adjustment screw passes through the positioning through-hole of the first "Z"-shaped plate, and the positioning stud at the lower end of the fine adjustment screw is placed in the positioning blind hole of the transverse moving rod. One end of the fine adjustment handle is connected to the positioning stud at the upper end of the fine adjustment screw. The present invention can realize the fine adjustment function of the relative position between the shaft of the angular displacement potentiometer and the measuring head of the micrometer in the natural state and the compressed state, and finally realize the high-precision measurement function of the radial clearance of the shaft of the angular displacement potentiometer. Moreover, the operation is simple and reliable, which is conducive to popularization and application.

Description

Technical Field

[0001] The present invention relates to an angular displacement potentiometer measuring device, and in particular to a high-precision measuring device for measuring the radial clearance of the rotating shaft of an angular displacement potentiometer, belonging to the production technical field of angular displacement potentiometers. Background Art

[0002] With the miniaturization and informatization of products, electric servo mechanisms play a major role in more and more servo control systems, and the angular displacement potentiometers used for position feedback in supporting use are also widely used. The basic structure of an angular displacement potentiometer includes a housing and a rotating shaft. The inner end of the rotating shaft is connected to other components placed inside the housing (generally including components such as an insulating sleeve, a slip ring, a brush, a resistor body, etc., all of which are conventional structures and are not relevant to the innovation of this application, so there is no need to describe them in detail). The inner end of the lead wire is connected to the resistor body inside the housing. When in use, the rotating shaft drives the brush to contact and slide on the resistor strip of the resistor body, generating a changing electrical signal. This electrical signal has a corresponding relationship with the rotation angle of the rotating shaft, thereby realizing the angular displacement detection function.

[0003] The size of the radial clearance between the rotating shaft of the angular displacement potentiometer and the corresponding connecting components is an important parameter of the angular displacement potentiometer. This parameter is related to the magnitude of the radial swing of the rotating shaft and is one of the important parameters for the quality of the lateral angular displacement potentiometer.

[0004] Since the radial clearance of the rotating shaft of the angular displacement potentiometer is very small, the measurement is difficult. The traditional measurement method generally measures the difference between the natural state and the compressed state of the rotating shaft in the radial direction through a micrometer. This difference is the radial clearance of the rotating shaft of the angular displacement potentiometer. This traditional measurement method has the following defects: there is no high-precision adjustment structure to realize the relative position adjustment function of the rotating shaft and the micrometer probe in the natural state and the compressed state, nor is there a corresponding positioning structure to reliably position the angular displacement potentiometer. Therefore, the measurement accuracy is low, the operation is difficult, and the measurement result depends greatly on the experience of the operator. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-precision measuring device for measuring the radial clearance of the rotating shaft of an angular displacement potentiometer with high measurement accuracy and convenient operation in order to solve the above problems.

[0006] The present invention realizes the above purpose through the following technical solutions:

[0007] A high-precision measuring device for measuring the radial clearance of the shaft of an angular displacement potentiometer, comprising a base and a micrometer, and further comprising a potentiometer positioning mechanism for clamping and positioning the angular displacement potentiometer, a pressurizing weight for applying pressure to the shaft of the angular displacement potentiometer, a micrometer rough positioning mechanism for moving and fixing the micrometer over a large distance, and a micrometer fine positioning mechanism for moving and fixing the micrometer vertically over a small distance. The potentiometer positioning mechanism and the micrometer rough positioning mechanism are respectively installed on the base. The micrometer rough positioning mechanism comprises a transverse moving rod capable of moving and fixing horizontally and vertically. The micrometer fine positioning mechanism comprises a first "Z"-shaped plate, a second "Z"-shaped plate, a fine adjustment handle and a fine adjustment screw. Both the first "Z"-shaped plate and the second "Z"-shaped plate are formed by connecting a upper cross plate, a vertical plate and a lower cross plate end to end. The lower cross plate of the first "Z"-shaped plate is installed on the upper surface of one end of the transverse moving rod with a square radial cross section. The upper cross plate of the first "Z"-shaped plate is provided with a vertical positioning through hole. A vertical positioning blind hole is provided at the position on the upper surface of the transverse moving rod directly below the positioning through hole. The upper and lower ends of the vertical fine adjustment screw are respectively provided with positioning studs without threads and with an outer diameter smaller than the outer diameter of the middle section of the fine adjustment screw. The positioning stud at the upper end of the fine adjustment screw passes through the positioning through hole, and the positioning stud at the lower end of the fine adjustment screw is placed in the positioning blind hole. One end of the transverse fine adjustment handle is provided with a vertical connecting column, and this connecting column is connected to the positioning stud at the upper end of the fine adjustment screw. The upper cross plate of the second "Z"-shaped plate is provided with a vertical fine adjustment screw hole, and the fine adjustment screw passes through this fine adjustment screw hole and is threadedly connected. The side surface of one side of the vertical plate of the second "Z"-shaped plate is in surface contact with the corresponding end surface of the transverse moving rod. The lower cross plate of the second "Z"-shaped plate is provided with a vertical micrometer mounting hole, and the vertical fixing rod of the micrometer passes through the micrometer mounting hole and is fixedly connected. The lower end of the fixing rod of the micrometer is provided with a vertical measuring rod, and the lower end of the measuring rod is provided with a measuring head. A potentiometer groove for placing the angular displacement potentiometer is provided at the position on the base diagonally below the measuring head. The potentiometer positioning mechanism is located beside the potentiometer groove.

[0008] Preferably, in order to achieve more precise guidance for the second "Z"-shaped plate, a vertical and concave guiding groove is provided on the end surface of the transverse moving rod corresponding to the vertical plate of the second "Z"-shaped plate, and a vertical and convex guiding strip is provided on the corresponding side surface of the vertical plate of the second "Z"-shaped plate. The guiding strip is placed in the guiding groove.

[0009] Preferably, in order to achieve more precise and reliable vertical movement guidance for the second "Z"-shaped plate, the two side wall surfaces of the guiding groove are both inclined surfaces and the groove width at the open end is smaller than the groove width at the bottom. The radial cross-sectional shape of the guiding strip is the same as the radial cross-sectional shape of the guiding groove.

[0010] Preferably, in order to facilitate the stable and reliable installation of the first "Z"-shaped plate, an installation groove is provided on the upper surface of the transverse moving rod near the first "Z"-shaped plate, and a vertical screw hole is provided at the bottom of the installation groove. The lower cross plate of the first "Z"-shaped plate is placed in the installation groove, and the screw rod of the "Z"-shaped plate installation screw passes through the corresponding through hole on the lower cross plate of the first "Z"-shaped plate and is connected to the screw hole at the bottom of the installation groove.

[0011] Preferably, in order to facilitate the movement and fixation of the transverse moving rod over a large distance at multiple horizontal angles and vertically, the micrometer rough positioning mechanism further includes a rotating seat, a guiding rod, and a moving seat. A circular sunk groove is provided on the upper surface of the base, and a screw hole is provided at the center position of the bottom of the circular sunk groove. The disk-shaped rotating seat is placed in the circular sunk groove. A vertical through hole of the rotating seat is provided at the center position of the rotating seat. The screw rod of the rotating seat installation screw passes through the through hole of the rotating seat and is connected to the screw hole at the bottom of the circular sunk groove. The lower ends of the two vertical guiding rods are installed on the rotating seat. Two vertical through holes of the moving seat are provided on the moving seat, and the two guiding rods respectively pass through the two vertical through holes of the moving seat. Transverse screw holes of the moving seat are respectively provided at positions corresponding to the two vertical through holes of the moving seat on the moving seat. The inner ends of the two transverse screw holes of the moving seat communicate with the two vertical through holes of the moving seat respectively. The screw rods of the two moving seat fixing screws are respectively connected to the two transverse screw holes of the moving seat. A transverse through hole of the moving seat with a square radial cross-section is provided at a position between the two vertical through holes of the moving seat on the moving seat. The transverse moving rod passes through the transverse through hole of the moving seat. A vertical screw hole of the moving seat is provided at a position corresponding to the transverse through hole of the moving seat on the moving seat. The inner end of the vertical screw hole of the moving seat communicates with the transverse through hole of the moving seat, and the screw rod of the moving rod fixing screw is connected to the vertical screw hole of the moving seat.

[0012] Preferably, in order to facilitate the installation of the moving rod fixing screw, a moving rod fixing seat is provided on one side of the moving seat away from the micrometer fine positioning mechanism. A transverse through hole communicating with the transverse through hole of the moving seat is provided on the moving rod fixing seat, and the transverse moving rod passes through the transverse through hole. The vertical screw hole of the moving seat is provided on the moving rod fixing seat.

[0013] Preferably, in order to achieve rapid pressing and positioning of the angular displacement potentiometer, the potentiometer positioning mechanism includes two positioning rods, two "V"-shaped pressing blocks, two compression springs, two pressing connecting rods and two cam pressing handles. The lower ends of the two vertical positioning rods are installed on the base. A horizontally penetrating opening groove is provided in the middle of the positioning rod in the horizontal direction. One ends of the two pressing connecting rods are respectively connected to the two "V"-shaped pressing blocks. The two relatively arranged "V"-shaped pressing blocks are located obliquely below the measuring heads of the dial indicators and on the opposite sides of the potentiometer groove. The other ends of the two pressing connecting rods are respectively rotatably connected to the two cam pressing handles. The two pressing connecting rods respectively pass through the opening grooves of the two positioning rods. The two compression springs are respectively sleeved on the two pressing connecting rods and are located between the corresponding "V"-shaped pressing blocks and the positioning rods. The two cam pressing handles are respectively located outside the two positioning rods in the direction away from each other and cannot pass through the opening grooves.

[0014] Preferably, in order to facilitate the rapid adjustment of the vertical height of the "V"-shaped pressing block to meet the pressing requirements of angular displacement potentiometers of different sizes, a positioning block is provided in the opening groove of the positioning rod. A horizontally arranged positioning through hole is provided on the positioning block. The two pressing connecting rods respectively pass through the positioning through holes on the two positioning blocks. Horizontally arranged positioning screw holes are provided on the positioning rod. The plurality of positioning screw holes are arranged vertically. The screw rods of the positioning screws respectively pass through the corresponding positioning screw holes and then abut against the outer walls of the corresponding positioning blocks.

[0015] Preferably, in order to facilitate the rapid adjustment of the distance between the two "V"-shaped pressing blocks to meet the pressing requirements of angular displacement potentiometers of different sizes, a horizontally arranged positioning plate is connected to the lower end of the positioning rod. Vertically arranged positioning plate mounting screw holes are respectively provided at positions corresponding to the two positioning plates on the upper surface of the base. A vertically penetrating strip-shaped through hole is provided on the positioning plate. The screw rod of the positioning plate fixing screw passes through the strip-shaped through hole on the corresponding positioning plate and is connected to the corresponding positioning plate mounting screw hole.

[0016] Preferably, in order to enable the height of the "V"-shaped pressing block to better meet the height position requirements of the angular displacement potentiometer, sunken rectangular grooves are respectively provided at positions corresponding to the two positioning plates on the upper surface of the base. The two positioning plate mounting screw holes are respectively provided at the bottoms of the two rectangular grooves.

[0017] The beneficial effects of the present invention are as follows:

[0018] The present invention can realize the fine adjustment function of the relative position between the rotating shaft of the angular displacement potentiometer and the measuring head of the dial indicator in the natural state and the compressed state by designing a dial indicator fine positioning mechanism that can finely adjust the position of the dial indicator vertically. At the same time, the positioning function of the angular displacement potentiometer is realized through the potentiometer positioning mechanism, and the functions of moving and fixing the dial indicator horizontally and vertically are realized through the dial indicator rough positioning mechanism. A pressure weight that can apply a standard pressure to the rotating shaft of the angular displacement potentiometer is used to finally realize the high-precision measurement function of the radial clearance of the rotating shaft of the angular displacement potentiometer. The operation is simple and reliable, and the measurement result is less dependent on the experience of the operator, which is conducive to popularization and application. Brief Description of the Drawings

[0019] Figure 1 Fig. is a three-dimensional structural schematic diagram when the high-precision measuring device for measuring the radial clearance of the rotating shaft of the angular displacement potentiometer described in the present invention is in use;

[0020] Figure 2 Fig. is a front view structural schematic diagram when the high-precision measuring device for measuring the radial clearance of the rotating shaft of the angular displacement potentiometer described in the present invention is in use;

[0021] Figure 3 Fig. is a left view structural schematic diagram when the high-precision measuring device for measuring the radial clearance of the rotating shaft of the angular displacement potentiometer described in the present invention is in use;

[0022] Figure 4 Fig. is a partially-sectioned front view structural schematic diagram when the high-precision measuring device for measuring the radial clearance of the rotating shaft of the angular displacement potentiometer described in the present invention is in use;

[0023] Figure 5 Fig. is an enlarged view of "A" in the partially-sectioned front view structural schematic diagram when the high-precision measuring device for measuring the radial clearance of the rotating shaft of the angular displacement potentiometer described in the present invention is in use.

[0024] In the figure, 1 - horizontal moving rod, 2 - moving rod fixing seat, 3 - moving rod fixing screw, 4 - guide rod, 5 - moving seat, 6 - moving seat fixing screw, 7 - rotating seat, 8 - rotating seat mounting screw, 9 - base, 10 - first "Z"-shaped plate, 11 - dial indicator, 12 - fine adjustment handle, 13 - fine adjustment screw rod, 14 - second "Z"-shaped plate, 15 - fixed rod, 16 - angular displacement potentiometer, 17 - measuring rod, 18 - rotating shaft, 19 - "V"-shaped pressing block, 20 - pressing connecting rod, 21 - positioning rod, 22 - cam pressing handle, 23 - compression spring, 24 - positioning screw, 25 - positioning screw hole, 26 - positioning plate, 27 - positioning plate fixing screw, 28 - rectangular sunk groove, 29 - pressure weight, 30 - positioning block, 31 - guide strip. Detailed Embodiment

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] As Figures 1 - 5 shown, the high-precision measuring device for measuring the radial clearance of the shaft of an angular displacement potentiometer according to the present invention includes a base 9, a micrometer 11, a potentiometer positioning mechanism for clamping and positioning the angular displacement potentiometer 16, a pressure-applying weight 29 for applying pressure to the shaft 18 of the angular displacement potentiometer 16, a rough positioning mechanism for the micrometer 11 to move and fix over a large distance, and a fine positioning mechanism for the micrometer 11 to move and fix vertically over a small distance. The potentiometer positioning mechanism and the rough positioning mechanism for the micrometer are respectively installed on the base 9. The rough positioning mechanism for the micrometer includes a lateral moving rod 1 capable of moving and fixing horizontally and vertically. The fine positioning mechanism for the micrometer includes a first "Z"-shaped plate 10, a second "Z"-shaped plate 14, a fine adjustment handle 12, and a fine adjustment screw 13. Both the first "Z"-shaped plate 10 and the second "Z"-shaped plate 14 are formed by connecting a upper horizontal plate, a vertical plate, and a lower horizontal plate end to end. The lower horizontal plate of the first "Z"-shaped plate 10 is installed on the upper surface of the lateral moving rod 1 with a square radial cross-section near one end thereof. The upper horizontal plate of the first "Z"-shaped plate 10 is provided with a vertical positioning through-hole (not marked in the figure). The upper surface of the lateral moving rod 1 at a position directly below the positioning through-hole is provided with a vertical positioning blind-hole (not marked in the figure). The upper and lower ends of the vertical fine adjustment screw 13 are respectively provided with positioning studs (not marked in the figure) without threads and with an outer diameter smaller than the outer diameter of the middle section of the fine adjustment screw. The positioning stud at the upper end of the fine adjustment screw 13 passes through the positioning through-hole, and the positioning stud at the lower end of the fine adjustment screw 13 is placed in the positioning blind-hole. One end of the horizontal fine adjustment handle 12 is provided with a vertical connecting column (not marked in the figure) and this connecting column is connected to the positioning stud at the upper end of the fine adjustment screw 13. The upper horizontal plate of the second "Z"-shaped plate 14 is provided with a vertical fine adjustment screw hole (not marked in the figure) and the fine adjustment screw 13 passes through this fine adjustment screw hole and is threadedly connected. The side surface of the vertical plate of the second "Z"-shaped plate 14 is in surface contact with the corresponding end surface of the lateral moving rod 1. The lower horizontal plate of the second "Z"-shaped plate 14 is provided with a vertical micrometer mounting hole (not marked in the figure). The vertical fixing rod 15 of the micrometer 11 passes through the micrometer mounting hole and is fixedly connected. The lower end of the fixing rod 15 of the micrometer 11 is provided with a vertical measuring rod 17. The lower end of the measuring rod 17 is provided with a measuring head (not visible in the figure, blocked by the hook of the pressure-applying weight 29). On the base 9 at a position obliquely below the measuring head, there is a potentiometer groove for placing the angular displacement potentiometer 16 (not visible in the figure, blocked by the angular displacement potentiometer 16). The potentiometer positioning mechanism is located beside the potentiometer groove.

[0027] As Figures 1 - 5 shown, the present invention also discloses the following multiple more optimized specific structures. According to actual needs, the above structure can be superimposed and combined with one or more of the following structures to form a more optimized technical solution.

[0028] In order to achieve more precise guidance for the second "Z"-shaped plate 14, a vertically concave guiding groove (not visible in the figure but easy to understand) is provided on the end surface of the transverse moving rod 1 corresponding to the vertical plate of the second "Z"-shaped plate 14. A vertically convex guiding strip 31 is provided on the corresponding side surface of the vertical plate of the second "Z"-shaped plate 14, and the guiding strip 31 is placed in the guiding groove.

[0029] In order to achieve more precise and reliable vertical movement guidance for the second "Z"-shaped plate 14, the two side wall surfaces of the guiding groove are both inclined planes and the groove width at the open end is smaller than the groove width at the bottom. The radial cross-sectional shape of the guiding strip 31 is the same as the radial cross-sectional shape of the guiding groove. In this way, the guiding strip 31 can only move vertically in the guiding groove and cannot move horizontally, so that only the thread transmission function is borne between the second "Z"-shaped plate 14 and the fine adjustment screw 13, and the lateral limiting function for the second "Z"-shaped plate 14 is not borne, making it more convenient to operate the fine adjustment handle 12 to rotate and achieve the fine adjustment and positioning functions of the vertical position of the dial indicator 11.

[0030] In order to facilitate the stable and reliable installation of the first "Z"-shaped plate 10, an installation groove (not marked in the figure) is provided on the upper surface of the transverse moving rod 1 close to the first "Z"-shaped plate 10, and a vertical screw hole is provided at the bottom of the installation groove. The lower horizontal plate of the first "Z"-shaped plate 10 is placed in the installation groove, and the screw of the "Z"-shaped plate installation screw (not marked in the figure) passes through the corresponding through hole on the lower horizontal plate of the first "Z"-shaped plate 10 and is connected to the screw hole at the bottom of the installation groove.

[0031] To facilitate the large-distance movement and fixation of the horizontal moving rod 1 both horizontally at multiple angles and vertically, the micrometer rough positioning mechanism further includes a rotating seat 7, a guiding rod 4, and a moving seat 5. A circular sunk groove (not marked in the figure) is provided on the upper surface of the base 9, and a screw hole (not marked in the figure) is provided at the center of the bottom of the circular sunk groove. The disk-shaped rotating seat 7 is placed in the circular sunk groove. A vertical through hole of the rotating seat (not marked in the figure) is provided at the center of the rotating seat 7. The screw rod of the rotating seat mounting screw 8 passes through the through hole of the rotating seat and is connected to the screw hole at the bottom of the circular sunk groove. The lower ends of the two vertical guiding rods 4 are mounted on the rotating seat 7. The moving seat 5 is provided with two vertical through holes of the moving seat, and the two guiding rods 4 respectively pass through the two vertical through holes of the moving seat. At positions corresponding to the two vertical through holes of the moving seat on the moving seat 5, there are respectively provided horizontal screw holes of the moving seat. The inner ends of the two horizontal screw holes of the moving seat communicate with the two vertical through holes of the moving seat respectively. The screw rods of the two moving seat fixing screws 6 are respectively connected to the two horizontal screw holes of the moving seat. At a position between the two vertical through holes of the moving seat 5, there is provided a horizontal through hole of the moving seat with a square radial cross-section. The horizontal moving rod 1 passes through the horizontal through hole of the moving seat. At a position corresponding to the horizontal through hole of the moving seat on the moving seat 5, there is provided a vertical screw hole of the moving seat. The inner end of the vertical screw hole of the moving seat communicates with the horizontal through hole of the moving seat. The screw rod of the moving rod fixing screw 3 is connected to the vertical screw hole of the moving seat.

[0032] To facilitate the installation of the moving rod fixing screw 3, a moving rod fixing seat 2 is provided on one side of the moving seat 5 away from the micrometer fine positioning mechanism. The moving rod fixing seat 2 is provided with a horizontal through hole communicating with the horizontal through hole of the moving seat, and the horizontal moving rod 1 passes through the horizontal through hole. The vertical screw hole of the moving seat is provided on the moving rod fixing seat 2.

[0033] To achieve the quick pressing and positioning of the diagonal displacement potentiometer 16, the potentiometer positioning mechanism includes two positioning rods 21, two "V"-shaped pressing blocks 19, two compression springs 23, two pressing connecting rods 20, and two cam pressing handles 22. The lower ends of the two vertical positioning rods 21 are mounted on the base 9. A horizontally penetrating opening groove is provided in the middle of the horizontal direction of the positioning rod 21. One ends of the two pressing connecting rods 20 are respectively connected to the two "V"-shaped pressing blocks 19. The two relatively arranged "V"-shaped pressing blocks 19 are located obliquely below the measuring head of the micrometer 11 and on the opposite sides of the potentiometer groove. The other ends of the two pressing connecting rods 20 are respectively rotatably connected to the two cam pressing handles 22. The two pressing connecting rods 20 respectively pass through the opening grooves of the two positioning rods 21. The two compression springs 23 are respectively sleeved on the two pressing connecting rods 20 and are located between the corresponding "V"-shaped pressing blocks 19 and the positioning rods 21. The two cam pressing handles 22 are respectively located on the outer sides of the two positioning rods 21 in the direction away from each other and cannot pass through the opening grooves.

[0034] In order to facilitate the rapid adjustment of the vertical height of the "V"-shaped pressing block 19 to meet the pressing requirements of angular displacement potentiometers 16 of different sizes, a positioning block 30 is provided in the open slot of the positioning rod 21. A horizontal positioning through hole is provided on the positioning block 30. Two pressing connecting rods 20 respectively pass through the positioning through holes on the two positioning blocks 30. A horizontal positioning screw hole 25 is provided on the positioning rod 21. Multiple positioning screw holes 25 are arranged vertically. The screws of the positioning screws 24 respectively pass through the corresponding positioning screw holes 25 and then abut against the outer walls of the corresponding positioning blocks 30.

[0035] In order to facilitate the rapid adjustment of the distance between the two "V"-shaped pressing blocks 19 to meet the pressing requirements of angular displacement potentiometers 16 of different sizes, a horizontal positioning plate 26 is connected to the lower end of the positioning rod 21. Vertically arranged positioning plate mounting screw holes are respectively provided at positions corresponding to the two positioning plates 26 on the upper surface of the base 9. A vertically penetrating strip-shaped through hole is provided on the positioning plate 26. The screw of the positioning plate fixing screw 27 passes through the strip-shaped through hole on the corresponding positioning plate 26 and then is connected to the corresponding positioning plate mounting screw hole.

[0036] In order to enable the height of the "V"-shaped pressing block 19 to better meet the height position requirements of the angular displacement potentiometer 16, sunken rectangular grooves 28 are respectively provided at positions corresponding to the two positioning plates 26 on the upper surface of the base 9. The two positioning plate mounting screw holes are respectively provided at the bottoms of the two rectangular grooves 28.

[0037] As Figures 1 - 5As shown in the figure, during application, first, according to the actual size of the angular displacement potentiometer 16, adjust the horizontal positions of the two "V"-shaped pressing blocks 19 through the positioning plate fixing screws 27, and adjust the vertical positions of the two "V"-shaped pressing blocks 19 through the positioning screws 24. Then press down the two cam pressing handles 22 to overcome the elastic force of the compression spring 23 and pull the pressing connecting rod 20 to move in the direction away from each other, increasing the gap between the two "V"-shaped pressing blocks 19. Then place the angular displacement potentiometer 16 in the potentiometer groove on the base 9. Then release the two cam pressing handles 22. Under the elastic force of the compression spring 23, the two "V"-shaped pressing blocks 19 move towards each other until the angular displacement potentiometer 16 is tightly pressed from both sides, completing the clamping and fixing of the angular displacement potentiometer 16. Then loosen the rotating seat mounting screw 8 and the moving rod fixing screw 3, rotate the rotating seat 7 and the moving horizontal moving rod 1 so that the probe of the micrometer 11 is approximately located directly above the rotating shaft 18 of the angular displacement potentiometer 16, and then lock the rotating seat mounting screw 8 and the moving rod fixing screw 3. Then hang the hook of the pressure weight 29 on the rotating shaft 18 of the angular displacement potentiometer 16 to make the rotating shaft 18 move down to the limit position (the moving distance is very small). Then loosen the moving seat fixing screw 6, vertically move the moving seat 5 to make the probe of the micrometer 11 as close as possible to the rotating shaft 18 of the angular displacement potentiometer 16, and then lock the moving seat fixing screw 6, thus completing the rough adjustment process of the position of the micrometer 11. Then rotate the fine adjustment handle 12 to drive the second "Z"-shaped plate 14 and the micrometer 11 to move down until the probe of the micrometer 11 contacts the rotating shaft 18 of the angular displacement potentiometer 16, and then zero the micrometer 11, completing the fine adjustment process of the vertical position of the micrometer 11. Finally, remove the pressure weight 29, and the rotating shaft 18 of the angular displacement potentiometer 16 automatically resets, pushing the probe of the micrometer 11 to move upward. After waiting for the reset of the rotating shaft 18 to end and the pointer position of the micrometer 11 no longer changes, the reading of the micrometer 11 at this time is the radial clearance value of the rotating shaft 18 of the angular displacement potentiometer 16 in one direction. Then rotate the rotating shaft 18 of the angular displacement potentiometer 16 by 90°, or rotate the angular displacement potentiometer 16 by 90°, then install the pressure weight 29 and re-perform the fine adjustment process of the vertical position of the micrometer 11, and measure in the same way to obtain the radial clearance value of the rotating shaft 18 of the angular displacement potentiometer 16 in another direction. And so on. After the angular displacement potentiometer 16 or its rotating shaft 18 rotates continuously in the same direction 3 times by 90°, the radial clearance values of the rotating shaft 18 of the angular displacement potentiometer 16 in four directions are obtained. These four radial clearance values can reflect the magnitude of the radial swing of the rotating shaft 18 and whether its centricity meets the requirements.

[0038] The above embodiments are only the preferred embodiments of the present invention and do not limit the technical solutions of the present invention. As long as the technical solutions that can be achieved on the basis of the above embodiments without creative labor shall be regarded as falling within the scope of the patent rights of the present invention.

Claims

1. A high-precision measuring device for measuring the radial clearance of the shaft of an angular displacement potentiometer, comprising a base and a micrometer, characterized in that: It further includes a potentiometer positioning mechanism for clamping and positioning the angular displacement potentiometer, a pressure-applying weight for applying pressure to the rotating shaft of the angular displacement potentiometer, a micrometer rough positioning mechanism for moving and fixing the micrometer over a large distance, and a micrometer fine positioning mechanism for moving and fixing the micrometer vertically over a small distance. The potentiometer positioning mechanism and the micrometer rough positioning mechanism are respectively installed on the base. The micrometer rough positioning mechanism includes a horizontal moving rod capable of moving and fixing horizontally and vertically. The micrometer fine positioning mechanism includes a first "Z"-shaped plate, a second "Z"-shaped plate, a fine adjustment handle, and a fine adjustment screw. Both the first "Z"-shaped plate and the second "Z"-shaped plate are formed by connecting a upper horizontal plate, a vertical plate, and a lower horizontal plate end to end. The lower horizontal plate of the first "Z"-shaped plate is installed on the upper surface of the horizontal moving rod with a square radial cross-section near one end thereof. The upper horizontal plate of the first "Z"-shaped plate is provided with a vertical positioning through-hole. A vertical positioning blind-hole is provided at a position on the upper surface of the horizontal moving rod directly below the positioning through-hole. The upper and lower ends of the vertical fine adjustment screw are respectively provided with positioning studs without threads and with an outer diameter smaller than the outer diameter of the middle section of the fine adjustment screw. The positioning stud at the upper end of the fine adjustment screw passes through the positioning through-hole, and the positioning stud at the lower end of the fine adjustment screw is placed in the positioning blind-hole. One end of the horizontal fine adjustment handle is provided with a vertical connecting column, and this connecting column is connected to the positioning stud at the upper end of the fine adjustment screw. The upper horizontal plate of the second "Z"-shaped plate is provided with a vertical fine adjustment screw hole, and the fine adjustment screw passes through this fine adjustment screw hole and is threadedly connected. The side surface of the vertical plate of the second "Z"-shaped plate is in surface contact with the corresponding end surface of the horizontal moving rod. The lower horizontal plate of the second "Z"-shaped plate is provided with a vertical micrometer mounting hole, and the vertical fixing rod of the micrometer passes through the micrometer mounting hole and is fixedly connected. The lower end of the fixing rod of the micrometer is provided with a vertical measuring rod, and the lower end of the measuring rod is provided with a measuring head. A potentiometer groove for placing the angular displacement potentiometer is provided at a position on the base diagonally below the measuring head. The potentiometer positioning mechanism is located beside the potentiometer groove; a vertical and concave guide groove is provided on the end surface of the horizontal moving rod corresponding to the vertical plate of the second "Z"-shaped plate, and a vertical and convex guide strip is provided on the corresponding side surface of the vertical plate of the second "Z"-shaped plate. The guide strip is placed in the guide groove;The dial indicator rough positioning mechanism further includes a rotating seat, a guiding rod, and a moving seat. A circular sunk groove is provided on the upper surface of the base, and a screw hole is provided at the center of the bottom of the circular sunk groove. The disk-shaped rotating seat is placed in the circular sunk groove. A vertical through hole of the rotating seat is provided at the center of the rotating seat. The screw rod of the rotating seat mounting screw passes through the through hole of the rotating seat and is connected to the screw hole at the bottom of the circular sunk groove. The lower ends of two vertical guiding rods are mounted on the rotating seat. Two vertical through holes of the moving seat are provided on the moving seat, and the two guiding rods respectively pass through the two vertical through holes of the moving seat. Transverse screw holes of the moving seat are respectively provided at positions corresponding to the two vertical through holes of the moving seat on the moving seat. The inner ends of the two transverse screw holes of the moving seat communicate with the two vertical through holes of the moving seat respectively. The screw rods of two moving seat fixing screws are respectively connected to the two transverse screw holes of the moving seat. A transverse through hole of the moving seat with a square radial cross-section is provided at a position between the two vertical through holes of the moving seat on the moving seat. The transverse moving rod passes through the transverse through hole of the moving seat. A vertical screw hole of the moving seat is provided at a position corresponding to the transverse through hole of the moving seat on the moving seat. The inner end of the vertical screw hole of the moving seat communicates with the transverse through hole of the moving seat. The screw rod of the moving rod fixing screw is connected to the vertical screw hole of the moving seat. ; 2. The high-precision measuring device for measuring the radial clearance of the shaft of an angular displacement potentiometer according to claim 1, wherein: Both side wall surfaces of the guiding groove are inclined planes, and the width of the opening end of the groove is smaller than the width of the groove bottom. The radial cross-sectional shape of the guiding strip is the same as that of the guiding groove.

3. The high-precision measuring device for measuring the radial clearance of the angular displacement potentiometer shaft according to claim 1, characterized in that: An installation groove is provided on the upper surface of the transverse moving rod near the first "Z"-shaped plate, and a vertical screw hole is provided at the bottom of the installation groove. The lower horizontal plate of the first "Z"-shaped plate is placed in the installation groove. The screw rod of the "Z"-shaped plate installation screw passes through the corresponding through hole on the lower horizontal plate of the first "Z"-shaped plate and is connected to the screw hole at the bottom of the installation groove.

4. The high-precision measuring device for measuring the radial clearance of the angular displacement potentiometer shaft according to any one of claims 1-3, characterized in that: A moving rod fixing seat is provided on one side of the moving seat away from the micrometer fine positioning mechanism. The moving rod fixing seat is provided with a transverse through hole communicating with the transverse through hole of the moving seat, and the transverse moving rod passes through the transverse through hole. The vertical screw hole of the moving seat is provided on the moving rod fixing seat.

5. The high-precision measuring device for measuring the radial clearance of the angular displacement potentiometer shaft according to any one of claims 1-3, characterized in that: The potentiometer positioning mechanism includes two positioning rods, two "V"-shaped pressing blocks, two compression springs, two pressing connecting rods and two cam pressing handles. The lower ends of the two vertical positioning rods are installed on the base. A laterally penetrating opening groove is provided in the middle of the positioning rod in the lateral direction. One ends of the two pressing connecting rods are respectively connected to the two "V"-shaped pressing blocks. The two relatively arranged "V"-shaped pressing blocks are located obliquely below the measuring head of the micrometer and on the opposite sides of the potentiometer groove. The other ends of the two pressing connecting rods are respectively rotatably connected to the two cam pressing handles. The two pressing connecting rods respectively pass through the opening grooves of the two positioning rods. The two compression springs are respectively sleeved on the two pressing connecting rods and are located between the corresponding "V"-shaped pressing blocks and the positioning rods. The two cam pressing handles are respectively located on the outer sides of the two positioning rods in the direction away from each other and cannot pass through the opening grooves.

6. The high-precision measuring device for measuring the radial clearance of the angular displacement potentiometer shaft according to claim 5, characterized in that: A positioning block is provided in the opening groove of the positioning rod. A transverse positioning through hole is provided on the positioning block. The two pressing connecting rods respectively pass through the positioning through holes on the two positioning blocks. A transverse positioning screw hole is provided on the positioning rod. A plurality of the positioning screw holes are arranged vertically. The screw rods of the positioning screws respectively pass through the corresponding positioning screw holes and abut against the outer walls of the corresponding positioning blocks.

7. The high-precision measuring device for measuring the radial clearance of the shaft of an angular displacement potentiometer according to claim 5, wherein: A transverse positioning plate is connected to the lower end of the positioning rod. Vertically arranged positioning plate installation screw holes are respectively provided on the upper surface of the base at positions corresponding to the two positioning plates. A vertically penetrating strip-shaped through hole is provided on the positioning plate. The screw rod of the positioning plate fixing screw passes through the strip-shaped through hole on the corresponding positioning plate and is connected to the corresponding positioning plate installation screw hole.

8. The high-precision measuring device for measuring the radial clearance of the shaft of an angular displacement potentiometer according to claim 7, wherein: Rectangular sunken grooves are respectively provided on the upper surface of the base at positions corresponding to the two positioning plates. The two positioning plate installation screw holes are respectively provided at the bottoms of the two rectangular sunken grooves.

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